diff --git a/TestConcoreHpp.cpp b/TestConcoreHpp.cpp
new file mode 100644
index 0000000..54df52b
--- /dev/null
+++ b/TestConcoreHpp.cpp
@@ -0,0 +1,315 @@
+/**
+ * TestConcoreHpp.cpp
+ *
+ * Test suite for the Concore class API in concore.hpp.
+ * Covers: read_FM/write_FM round-trip, unchanged(), initval(),
+ *         mapParser(), default_maxtime(), and tryparam().
+ *
+ * Addresses Issue #484: adds coverage for the Concore class API.
+ *
+ * Compile:  g++ -std=c++11 -o TestConcoreHpp TestConcoreHpp.cpp
+ * Run:      ./TestConcoreHpp          (Linux/macOS)
+ *           TestConcoreHpp.exe        (Windows)
+ */
+
+#include <iostream>
+#include <fstream>
+#include <sstream>
+#include <string>
+#include <vector>
+#include <cmath>
+#include <cstdlib>
+
+#ifdef _WIN32
+  #include <direct.h>
+  #define MAKE_DIR(p) _mkdir(p)
+#else
+  #include <sys/stat.h>
+  #define MAKE_DIR(p) mkdir(p, 0755)
+#endif
+
+#include "concore.hpp"
+
+static int passed = 0;
+static int failed = 0;
+
+// ------------- helpers ---------------------------------------------------
+
+static void check(const std::string& testName, bool condition) {
+    if (condition) {
+        std::cout << "PASS: " << testName << std::endl;
+        ++passed;
+    } else {
+        std::cout << "FAIL: " << testName << std::endl;
+        ++failed;
+    }
+}
+
+static bool approx(double a, double b, double eps = 1e-9) {
+    return std::fabs(a - b) < eps;
+}
+
+static void write_file(const std::string& path, const std::string& data) {
+    std::ofstream f(path);
+    f << data;
+}
+
+static void rm(const std::string& path) {
+    std::remove(path.c_str());
+}
+
+static void setup_dirs() {
+    MAKE_DIR("in");
+    MAKE_DIR("in/1");
+    MAKE_DIR("in1");
+    MAKE_DIR("out1");
+}
+
+// ------------- read_FM ---------------------------------------------------
+
+static void test_read_FM_file() {
+    setup_dirs();
+    write_file("in1/v", "[3.0,0.5,1.5]");
+
+    Concore c;
+    c.delay = 0;
+    c.simtime = 0.0;
+
+    std::vector<double> v = c.read_FM(1, "v", "[0.0]");
+    check("read_FM size==2",             v.size() == 2);
+    check("read_FM[0]==0.5",             approx(v[0], 0.5));
+    check("read_FM[1]==1.5",             approx(v[1], 1.5));
+    check("read_FM simtime updated",     approx(c.simtime, 3.0));
+
+    rm("in1/v");
+}
+
+static void test_read_FM_missing_file_uses_initstr() {
+    setup_dirs();
+    rm("in1/no_port");
+
+    Concore c;
+    c.delay = 0;
+    c.simtime = 0.0;
+
+    std::vector<double> v = c.read_FM(1, "no_port", "[9.0,3.0]");
+    check("missing_file fallback size==1", v.size() == 1);
+    check("missing_file fallback val==3.0", approx(v[0], 3.0));
+}
+
+// ------------- write_FM --------------------------------------------------
+
+static void test_write_FM_creates_file() {
+    setup_dirs();
+
+    Concore c;
+    c.delay = 0;
+    c.simtime = 2.0;
+
+    c.write_FM(1, "w_out", {10.0, 20.0});
+
+    std::ifstream f("out1/w_out");
+    std::ostringstream ss;
+    ss << f.rdbuf();
+    std::string content = ss.str();
+
+    check("write_FM file not empty",        !content.empty());
+    check("write_FM contains value 10",     content.find("10") != std::string::npos);
+    check("write_FM contains simtime 2",    content.find("2")  != std::string::npos);
+
+    rm("out1/w_out");
+}
+
+// ------------- unchanged() -----------------------------------------------
+
+static void test_unchanged_after_read_is_false() {
+    setup_dirs();
+    write_file("in1/uc", "[1.0,0.1]");
+
+    Concore c;
+    c.delay = 0;
+    c.simtime = 0.0;
+
+    c.read_FM(1, "uc", "[0.0]");
+    check("unchanged after read is false", !c.unchanged());
+
+    rm("in1/uc");
+}
+
+static void test_unchanged_fresh_object_is_true() {
+    Concore c;
+    c.delay = 0;
+    check("unchanged fresh object is true", c.unchanged());
+}
+
+static void test_unchanged_second_call_after_false_is_true() {
+    setup_dirs();
+    write_file("in1/uc2", "[5.0,7.0]");
+
+    Concore c;
+    c.delay = 0;
+    c.simtime = 0.0;
+
+    c.read_FM(1, "uc2", "[0.0]");
+    c.unchanged();
+    bool u = c.unchanged();
+    check("unchanged second call is true", u);
+
+    rm("in1/uc2");
+}
+
+// ------------- retry exhaustion on empty file ----------------------------
+
+static void test_retry_empty_file_falls_back_to_initstr() {
+    setup_dirs();
+    write_file("in1/empty_port", "");
+
+    Concore c;
+    c.delay = 0;
+    c.simtime = 0.0;
+
+    std::vector<double> v = c.read_FM(1, "empty_port", "[7.0,5.0]");
+    check("retry exhaustion: initstr used",  v.size() == 1 && approx(v[0], 5.0));
+    check("retry exhaustion: retrycount>0",  c.retrycount > 0);
+
+    rm("in1/empty_port");
+}
+
+// ------------- initval() -------------------------------------------------
+
+static void test_initval_parses_simtime_and_data() {
+    Concore c;
+    c.delay = 0;
+
+    std::vector<double> v = c.initval("[4.0,1.0,2.0]");
+    check("initval size==2",        v.size() == 2);
+    check("initval[0]==1.0",        approx(v[0], 1.0));
+    check("initval[1]==2.0",        approx(v[1], 2.0));
+    check("initval simtime==4.0",   approx(c.simtime, 4.0));
+}
+
+static void test_initval_empty_input_returns_empty() {
+    Concore c;
+    c.delay = 0;
+
+    std::vector<double> v = c.initval("[]");
+    check("initval empty returns empty", v.empty());
+}
+
+// ------------- mapParser() -----------------------------------------------
+
+static void test_mapParser_reads_file() {
+    setup_dirs();
+    write_file("tmp_iport_test.txt", "{'u': 1}");
+
+    Concore c;
+    c.delay = 0;
+
+    auto m = c.mapParser("tmp_iport_test.txt");
+    check("mapParser has key u",  m.count("u") == 1);
+    check("mapParser value==1",   m["u"] == 1);
+
+    rm("tmp_iport_test.txt");
+}
+
+static void test_mapParser_missing_file_is_empty() {
+    rm("concore_noport_tmp.txt");
+
+    Concore c;
+    c.delay = 0;
+
+    auto m = c.mapParser("concore_noport_tmp.txt");
+    check("mapParser missing file is empty", m.empty());
+}
+
+// ------------- default_maxtime() -----------------------------------------
+
+static void test_default_maxtime_reads_file() {
+    setup_dirs();
+    write_file("in/1/concore.maxtime", "200");
+
+    Concore c;
+    c.delay = 0;
+    c.default_maxtime(100);
+
+    check("default_maxtime from file==200", c.maxtime == 200);
+
+    rm("in/1/concore.maxtime");
+}
+
+static void test_default_maxtime_fallback() {
+    rm("in/1/concore.maxtime");
+
+    Concore c;
+    c.delay = 0;
+    c.default_maxtime(42);
+
+    check("default_maxtime fallback==42", c.maxtime == 42);
+}
+
+// ------------- tryparam() ------------------------------------------------
+
+static void test_tryparam_found() {
+    setup_dirs();
+    write_file("in/1/concore.params", "{'alpha': '0.5', 'beta': '1.0'}");
+
+    Concore c;
+    c.delay = 0;
+    c.load_params();
+
+    check("tryparam found alpha",  c.tryparam("alpha", "0.0") == "0.5");
+    check("tryparam found beta",   c.tryparam("beta",  "0.0") == "1.0");
+
+    rm("in/1/concore.params");
+}
+
+static void test_tryparam_missing_key_uses_default() {
+    rm("in/1/concore.params");
+
+    Concore c;
+    c.delay = 0;
+    c.load_params();
+
+    check("tryparam missing key uses default",
+          c.tryparam("no_key", "def_val") == "def_val");
+}
+
+// ------------- main -------------------------------------------------------
+
+int main() {
+    std::cout << "===== Concore API Tests (Issue #484) =====\n\n";
+
+    // read_FM / write_FM
+    test_read_FM_file();
+    test_read_FM_missing_file_uses_initstr();
+    test_write_FM_creates_file();
+
+    // unchanged()
+    test_unchanged_after_read_is_false();
+    test_unchanged_fresh_object_is_true();
+    test_unchanged_second_call_after_false_is_true();
+
+    // retry exhaustion on empty file
+    test_retry_empty_file_falls_back_to_initstr();
+
+    // initval()
+    test_initval_parses_simtime_and_data();
+    test_initval_empty_input_returns_empty();
+
+    // mapParser()
+    test_mapParser_reads_file();
+    test_mapParser_missing_file_is_empty();
+
+    // default_maxtime()
+    test_default_maxtime_reads_file();
+    test_default_maxtime_fallback();
+
+    // tryparam()
+    test_tryparam_found();
+    test_tryparam_missing_key_uses_default();
+
+    std::cout << "\n=== Results: " << passed << " passed, " << failed
+              << " failed out of " << (passed + failed) << " tests ===\n";
+
+    return (failed > 0) ? 1 : 0;
+}